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Unformatted text preview: BICD 100 Genetics TA: Kathleen Yip Section Handout #3 Office Hours: F 9-10am, CLICS study tables, first floor Exam #1 Info: Average: ~ 85% for scantron section. Good job! Answer keys will not be online. Want to see the questions/answers? See me. Summary of lecture 7 & 8 Aneuploidy an increase or decrease in one chromosome (i.e. trisomy 21 [2n+1] produces Down syndrome) and caused by nondisjunction Polyploidy having >2 haploid sets of chromosomes. Most common in plants Nondisjunction an error in either meiosis I and/or II Primary Down Syndrome having three copies of chromosome #21 Familial Down Syndrome (refer to Figure 9-23 on p.253) usually caused by chromosomes 14 & 21, in which one of the two #21s attaches itself to #14 through a Robertsonian translocation. o Study Figure 9-23 (pg. 253) really well! Know why the ratios happen (for example, there are no Study Figure 9-23 (pg....
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This note was uploaded on 01/25/2011 for the course BICD 100 taught by Professor Nehring during the Spring '08 term at UCSD.
- Spring '08